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/*
* Copyright (C) 2023 Karel Zak <kzak@redhat.com>
*
* This file may be redistributed under the terms of the
* GNU Lesser General Public License.
*/
#include <stdlib.h>
#include "c.h"
#include "strutils.h"
#include "libmount.h"
#include "mount-api-utils.h" /* fallback for old linux/mount.h */
int main(int argc, char *argv[])
{
struct libmnt_fs *fs;
struct libmnt_statmnt *sm;
const char *mnt;
uint64_t id = 0;
if (argc != 2)
errx(EXIT_FAILURE, "usage: %s <mountpoint | id>",
program_invocation_short_name);
mnt_init_debug(0);
fs = mnt_new_fs();
if (!fs)
err(EXIT_FAILURE, "failed to allocate fs handler");
/* define target (mountpoint) or mount ID */
mnt = argv[1];
if (isdigit_string(mnt)) {
id = strtou64_or_err(mnt, "cannot ID");
mnt_fs_set_uniq_id(fs, id);
} else
mnt_fs_set_target(fs, mnt);
/*
* A) fetch all data without reference to libmnt_statmnt
*/
if (mnt_fs_fetch_statmount(fs, 0) != 0)
warn("failed to read data by statmount()");
mnt_fs_print_debug(fs, stdout);
/* reset */
id = mnt_fs_get_uniq_id(fs);
mnt_reset_fs(fs);
mnt_fs_set_uniq_id(fs, id);
/*
* B) fetch data by on-demand way
*/
sm = mnt_new_statmnt();
if (!sm)
err(EXIT_FAILURE, "failed to allocate statmount handler");
mnt_fs_refer_statmnt(fs, sm);
/* read fs type, but nothing else */
mnt_fs_get_fstype(fs);
mnt_fs_print_debug(fs, stdout);
/* read fs root, but nothing else */
mnt_fs_get_root(fs);
mnt_fs_print_debug(fs, stdout);
/* read all mising data */
mnt_fs_fetch_statmount(fs, 0);
mnt_fs_print_debug(fs, stdout);
/* see debug, this is no-op for statmount() */
mnt_fs_get_fstype(fs);
mnt_unref_fs(fs);
mnt_unref_statmnt(sm);
return EXIT_SUCCESS;
}
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